DeepStar Six is a science fiction horror movie released in 1989. The movie revolves around a group of scientists and engineers who are constructing an experimental nuclear base at the bottom of the ocean. The base is a prototype for future underwater settlements.
The team consists of a commander named Van Gelder, a marine biologist named Scarpelli, and a group of engineers and technicians. They are working on a tight schedule to finish the base before a missile launch from a nearby ship causes a massive underwater explosion.
The team faces numerous challenges during the construction, including malfunctions and accidents. On one such expedition, they come across a large cavern. When they explore it, they disturb an unknown creature that attacks their submersible. They manage to escape and return to the base, but the creature follows them and attacks their underwater base.
The team soon realizes that the creature is not a natural species and must have been exposed to radiation, which caused it to mutate and become aggressive. As the crew tries to fight off the creature and repair the base's damages, they also have to deal with tension and disputes among themselves.
The situation goes from bad to worse when the missile launch causes an earthquake that damages the base even more. The crew has to fight for their survival as they try to find a way to destroy the creature and prevent themselves from being trapped underwater.
Overall, DeepStar Six is a nail-biting thriller that combines elements of science fiction, horror, and drama. It stars Greg Evigan, Nancy Everhard, and Taurean Blacque and is directed by Sean S. Cunningham.